Andrew Wang created HDFS-6093:
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             Summary: Expose more caching information for debugging by users
                 Key: HDFS-6093
                 URL: https://issues.apache.org/jira/browse/HDFS-6093
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: caching
    Affects Versions: 2.4.0
            Reporter: Andrew Wang
            Assignee: Andrew Wang


When users submit a new cache directive, it's unclear if the NN has recognized 
it and is actively trying to cache it, or if it's hung for some other reason. 
It'd be nice to expose a "pending caching/uncaching" count the same way we 
expose pending replication work.

It'd also be nice to display the aggregate cache capacity and usage in dfsadmin 
-report, since we already have have it as a metric and expose it per-DN in 
report output.



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